<?php
session_start();
    $_SESSION['username'] ="";
    $_SESSION['userid']="";
    $_SESSION['useradmin'] ="";
    $_SESSION['adminid']="";
    session_unregister("username");
    session_unregister("userid");
    session_unregister("useradmin");
    session_unregister("adminid");    
       
    echo "<meta http-equiv = refresh ; content = '0 ; url = index.php'>";
?>
